Assess design engineering by following an interface beyond its ideal demonstration. Ask how it behaves when content changes, input fails, the screen shrinks, or someone uses a keyboard.
The goal is to understand how the candidate connects design intent with dependable implementation.
Review a bounded interaction
Use a candidate-selected public artifact or a fictional component supplied by the hiring team. Choose something small enough to inspect together, such as a searchable selector or a multi-step form.
Clarify which parts the candidate designed and implemented. Do not infer ownership from a portfolio credit alone.
Inspect the full behavior
| Area | Review question |
|---|---|
| Interaction | Is the user’s next action clear? |
| State | What happens during loading, empty results, errors, and recovery? |
| Content | Does the design tolerate longer or unexpected text? |
| Input | Can it be used without relying only on a mouse? |
| Implementation | Are responsibilities and state transitions understandable? |
| Maintenance | Can another engineer change it without recreating the design? |
Keyboard access is one concrete part of accessibility; a complete evaluation requires broader checks and knowledgeable human review. W3C accessibility guidance.
Ask for one change
Introduce a fictional requirement that affects both design and code. For example, the selector now needs to explain why an option is unavailable.
Ask the candidate to describe or make a small change, depending on the agreed format. Observe whether they consider the user’s understanding, the component interface, and edge cases together.
Do not expect a production-ready feature within an interview.
Discuss tradeoffs
Ask which aspects deserve refinement now and which can wait. Strong answers should connect polish to user value rather than treating every visual detail as equally important.
Explore how they would work with a designer who proposes a difficult interaction and an engineer concerned about complexity. The candidate should be able to make the tradeoff legible.
Record evidence separately
Distinguish visual judgment, interaction reasoning, coding ability, accessibility awareness, and collaboration. A strong score in one should not silently conceal an untested essential responsibility.
Use the design engineer versus product designer guide to set the mandate and the anchored scorecard to record the review. Discuss your hiring needs with Refery.